has nothing to do with the general linguistic knowledge, especially related with Slavic languages (to know that Albanian is not a Slavic language but has its own branche/group in the Indo-European tree of languages), nor with the philological knowledge about common Slavic lexic and roots, nor (more important) with the knowledge about linguistic ressources to research roots and etymologies (the usual modern dictionaries can be useful, but are not professional toolsin etymological researches).